Grit by Angela Duckworth. Quotes IV.

-The ten thousand hour rule and the then year rule.
-It is not that experts log more hours of practice. Rather, it's that experts practice differently.
-You are not improving because you are not doing deliberate practice.
-Experts strive to improve specific weaknesses.
-Many experts choose to strive while nobody is watching. The amount of time musicians devote to practicing alone is a much better predictor of how quickly they develop than time spent practicing with other musicians.
-What about reading for fun? Nada. There was not even a hint of a relationship between reading for fun, which they all enjoyed, and spelling prowess.
-Deliberate practice is experienced as supremely effortful.
-Deliberate practice is for preparation, and flow is for performance.
-Basic requirements of deliberate practice:
1. A clearly defined stretch goal.
2. Full concentration and effort.
3. Immediate and informative feedback.
4. Repetition with reflection and refinement.
-It's not hours of brute-force exhaustion you are after. It is high-quality, thoughtful training goals pursued, for just a few hours a day, tops.
-Trying to do things they cannot yet do, failing, and learning what they need to do differently is exactly they way experts practice.
-Focus on your weaknesses and focus one hundred per cent.
-Routines are godsend when it comes to doing something hard.
-When you have a habit of practicing at the same time and in the same place every day, you hardly have to think about getting started. You just do.